linux-kernel - Re: 2.6.19-rc1: Volanomark slowdown

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Date:	Wed, 08 Nov 2006 14:07:32 -0800
From:	Tim Chen <tim.c.chen@...ux.intel.com>
To:	Olaf Kirch <okir@...e.de>
Cc:	Arjan van de Ven <arjan@...radead.org>,
	linux-kernel@...r.kernel.org, davem@...set.davemloft.net,
	kuznet@....inr.ac.ru, netdev@...r.kernel.org
Subject: Re: 2.6.19-rc1: Volanomark slowdown

On Wed, 2006-11-08 at 23:10 +0100, Olaf Kirch wrote:

> 
> In fixing performance issues, the most obvious explanation isn't always
> the right one. It's quite possible you're right, sure.
> 
> What I'm saying though is that it doesn't rhyme with what I've seen of
> Volanomark - we ran 2.6.16 on a 4p Intel box for instance and it didn't
> come close to saturating a Gigabit pipe before it maxed out on CPU load.
> 

I am running Volanomark in a loopback mode on a 2P woodcrest box 
(4 cores).  So the configuration is a bit different.  

In my testing, the CPU utilization is at 100%.  So
increase in ACKs will cost CPU to devote more
time to process those ACKs and reduce throughput.

> 
> You could count the number of outbound packets dropped on the server.
> 

As I'm running in loopback mode, there are no dropped packets.

Thanks.

Tim

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